KEYWORDS: Breast cancer, Cancer detection, Biosensors, Graphene, Optical surfaces, Nanosheets, Cancer, Signal attenuation, Scanning electron microscopy
We report a graphene oxide integrated optical biosensor for the detection of breast cancer cell media. The graphene oxide nanosheets-coated long period grating (GO-LPG) serves as an optical transducer where the GO acts as a bridging interface between optical sensor and external medium. The principle of the optical biosensor is based on alerting the optical signal as a change of local refractive index caused by different analyte concentrations. The proposed biosensor has been implemented to detect the breast cancer cell media with ultrahigh sensitivity, opening the path as a bio-nano-photonic platform for biosensing and early diagnosis.
We propose an optical fiber immunosensor based on graphene oxide coated dual-peak long period grating (GO-dLPG), in which GO-IgG linking layer is used for rapid immunoassays. The binding interaction between antibody and antigen produced a detectable optical signal in terms of grating resonant wavelength shift, which was proportional to the analyte concentration. By deposition of GO overlay, the bulk RI sensitivity of dLPG was enhanced around 150%. The GO-coated dLPG was biofunctionalized by the immobilization of IgG to generate the biosensor. The IgG-bound GO-dLPG was used to detect the anti-IgG and anti-PSA, respectively, demonstrating high sensitivity and selectivity. The GO-dLPG biosensor can be further developed as a biosensing platform with advantages of label-free, real-time and low limit of detection.
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